Dust collector



H.4F. BICKEL AND B. L'MlNNIER.

DUST COLLECTOR.

APPLICATIUN FILED ocT. 2 8. 1921.

Patented June 27, 1922.

HENRY E. BICKEL, 0E PLAINEIELD, NEW JERSEY, AND BLYTHEJ. MINNIER, r0E WATERTOWN, NEWy YORK.4 y c Dusar COLLECTOR:

Specification of Letters Patent. Patented ,111113.271922..

Application led.v October 28,1921.v Serial No. 511,008.

To' all whom #may concern.'

Be it known that we, HENRY F. BIOKEL and BLYTHEA J. MINNIER, citizens of the United;l States, residing, respectively, at Plainfield', in the county voi" Union and State of New Jersey, and at Watertown, in the county of Jefferson and State of New York, have invented certain new and useful lmprovements in Dust Collectors, of which the following is a specilication.

This invention relatesto centrifugal dust collectors for use with air compressors, and particularly to thearrangement of an improved: collector'in combination with the air pump and pump governor of a railway air brake system, in such manner that air heretofore wasted` at thev governor is used to clean or partially clean the collector. The preferred embodiment of the invention is shown in the accompanying drawing, in which Figure 1 is a verticalV section of the collector, the principal plane of section passing through: the axisfot'v the device. The tangential inlet for cleaning air is, however, shown in section on a plane forward of the main plane of section, as will appear from an inspectionof Fig. 2.

Fig. 2is a sectionon the line 2-2 of Fig; 1, on a slightly enlarged scale.

Fig. 3 is a vertical section of astanda-rd air pump governor-modified in, accordance with the present invention.

Fig. 4 is a diagram of the pump, pump governor, dust collector and their connections with eachother.

The Vbody of the dust collector consists of a cylindrical shell 6 divided by'a truste-conical partition or baille 7 into a lower chamber 8 andan upper and smaller chamber 9. The baille 7 isdownwardly inclined toward a central aperture whose `margin is surrounded by a downward extending rim oril'ange 10.

Thelower end ot shell 6 is closed by a head 11 which is removably held by bolts 12 and Vwhich is provided with a centrall air admission port delinedby a tubular `vinward extension 13. `This is integral with head 11 and extends upward with-in chamber 8. It is thus surroundedy by an annular pocket, which, being below the path of air flowing through chamber 8 Vserves to collect and retain dustprecipitated from the air current. Mounted in tubular 'extension 1-3 is a spiral battle 14-`whose forni is clearly shown in the drawing-` The ballle14 is "surmounted by an `upward andy outwardflaring conoidal cupshapedbattle 15 whoseupward margin` is abovel the lower 'margin-of flange 10 and relatively close tot-he lower face of-baill'e 7 Formed iny the walls of extension 13- isa tangential airport 16, which receives compressed air through a nipple 17 and deli-'vers it into the admission-port delined by extension 13 in such manner as to produce a whirling llow over the suriacev of' spiral baille 14. Thisaction takes place only when the compressor is shutdown, as will be further explained, and is for the purposeof cleaning baille 114;

The upper end oi' shell 6' is closedby head 18, which is held by studs and nuts 1-9 or in any lequivalent manner. The studs-2O and nuts 21 serve as mea-ns for mounting the entire structure. The bushing 22is the connection for the intake pipe ofthe-air cornpressor'. c Surrounding the rintake connection and formed integrally with head 18-is an apertured cylindrical baille 23 which carries at its lower end a horizontal disk or plate baille 24 spaced a short distance above baille y 7. The periphery of this balileI 24 `is quite close to the interior of shell 6 and' the battles 7 and 24 thus co-act' to cause the air fto flow outward in a `stream of ever-diminishing thickness, and then after an abruptA change of direction, to issue intoy chamber 9in an annular stream which though thin is of such large circumference as to flow 'at relatively low velocity. n

The dust collector isconnected up withthe pumpy and pump governor as fshown'in Fig. 4. The bushing y22"receives the intake or suction. pipe 25 of' compressor 26 which is driven byV steam cylinder 27 inv the usual manner. The steam pipe 28leading'to cylinder 27'carriesl a pump governor29 which is standard in ally respects excepty one. c

The governor 2'9 (see Fig. 3) .includes thel usual steam-'valve 30, steam-valve actuating piston 3l, diaphragm 32, governor spring 33, and diaphragmvalve 34. The connection to the main reservoir is shown at.35.

Instead of the usual restricted atmospheric vent located between valve 34 and piston 31 we provide a choke nipple 36 to whichfis connected .a pipe 37. Pipe 37 is connected through a flexible hose v381 with` nipple 17.

The operation of the governor isr essentially unchanged.k When mai-n reservoir pressure, acting, on diaphragm 32, opens;

valve 34 against the opposition of the governor spring 33, main reservoir air is admitted above piston 31 faster than it can escape through choke nipple 36. Hence piston 31 moves downward and closes steam valve 30, thus shutting down the pump. Air continues to ilow through nipple 36 so long as the pump remains `out oi action, and this air escaping at tangential port 16 acts to clean baiile 14. When main reservoir pressure drops suiiciently spring 33 will close valve 34. Since choke nipple 36 vents the space above piston 31 valve 30 immediately opens putting the air pump into action, and ilow through port 16 almost'immediately ceases.

The air drawn by the pump flows through the separator, entering through the air admission port 13 in the bottom and ilowing out from the top through pipe 25. As it passes in through port 13 the spiral battle 14; imparts a whirling motion which persists as the air ilows through chamber 8. This causes dust particles to ilow by centrifugal iorce toward or against the cylindrical wall of chamber 8, and thus causes these particles to settle out oi the air current and accumulate in the annular pocket surrounding port 13 in the bottom oi chamber 8. The flaring cup 15 assists in directing the whirling flow outward and its upward edge deiines the lower margin oi an annnular passagethrough which an inward and downward air-iiow occurs. The momentum of suoli solid particles as may still remain in suspension tends to carry them to the bottom'oi cup 15 where they will collect.

The air next flows upward through port 10, then outward between baffles 7 and 24E, up around the periphery of balile 9A and through the ports in baiile 23 to pipe 25. These baliles with large areas presented to the air current, and low velocities oi air ilow assist in the settling out and arresting oi small dust particles. The device thus presents a series of dust separating and collecting instrumentalities the iirst depending on a whirling or vortex action and the others on sudden changes o'l direction in a slow-ilowing current.

An important Jfeature of the design is that the area of each air passage in the dust collector is greater than the cross sectional area of pipe 25 so that the velocity of air flow throughout the collector is lower than the velocity oi ilow in pipe 25. This is iavorable to eilicient dust removal and avoids the imposition of undue load on the pump.

The device may be cleaned from time to time by removing the lower head 11, and the connected cup 15.

lVhat is claimed is f 1. The combination oil an air pump; a dust-collecting device connected with the intake of said pump; a pump governor connected with said pump to start and stop the same and having a vent which discharges air as an incident to the governing function;

and a connection between said vent and the collector serving to discharge the vented air within the collector to perform a cleaning function.

2. The combination oi an air pump; a dust-collecting device connected with the intake of said pump and including a series ci dust collecting instrumentalities; a pump governor connected with said pump to start and stop the same and having a vent which discharges air while the pump is stopped by the governor; and a connection from said vent to the lirst dust collecting ,'instrumentality of said series, serving' to discharge said vented air through said instrumentality to perform a cleaning function, while the pump is stopped.

3. The combination of an air pump; a dust-collecting device connected with the intake-oi said pump and including a circular chamber and a baiile serving t0 direct air into said chamber with a whirling motion; pump governor connected with said pump to start and stop the same and having a vent which discharges air while the pump is stopped by the governor; and a connection from said vent serving to direct said discharged air across said baille to clean t-he same.

4. In a dust collector, the combination of a substantially vertical cylindrical shell having an axial entrance aperture at its lower end; abaiile serving to impart a whirling motion to the entering air; an upward and outward yflaring cup-shaped baille: within said shell.; a centrally apertured partition extending across said shell and having a iiange surrounding its central aperture and projecting downward below the upper margin oi said cup-shaped baille; and a discharge connection from said shell above said centrally apertured partition.

5. In a dust collector, the combination oi a substantially vertical cylindrical shell having an axial entrance aperture at its lower end; a baiile serving to impart a whirling motion to the entering air; an upward and outward flaring cup-shaped baiile within said shell; a centrally apertured partition extending across said shell and having a ilange surrounding its central aperture and projecting downward below the upper margin of said cup-shaped baiile; a second baiile extending across said shell immediately above said partition, there being a passage around the peripheral edge of said second baiiie; and a discharge connection from said shell above said second bailie.

In testimony whereof we have signed our names to this speciiication.

HENRY F. BICKEL. BLYTHE J. MINNIER. 

